Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh de » hanh de, thanh ve, thanh do
su sach » so sach, vu sach
cao xuc » cao duc, cao suc, chat xuc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((mang xa) or (nang x)) hoi. hieu va ((cao xuc) OR (cam xuc)) ban thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((mang xa) OR (nang x)) hoi. hieu va ((cao xuc) OR (cam xuc)) ban thanh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((mang xa) or (nang x)) hoi. hieu va ((cao xuc) OR (cam xuc)) ban thanh de cua tre*".